Study On Compressive Performance Of Web Steel Composite Wall

WEB Light-Gauge Joist Steel System is simply called WEB Steel, which is a kind of light steel residential housing system form. Web steel system have such advantages as wall thickness, light weight, good seismic performance, rapid construction speed, convenience of pipeline layout, thermal resistance, thermal insulation, fire protection, etc. It has been widely used in North America over the past 20 years. The main component of web steel building system is small truss which is consisted of two small light galvanized cold-formed thin-walled square pipe (rectangular pipe) and triangular pieces of V-Connecter. The truss can be used to construct beam, wall, floor and the roof.The wall is the major part to bear vertical and horizontal loads in web steel structure. Wall is composed of a number of small truss, square columns, sheath, tensile steel and the upper and lower C-track, etc. Any studies showed that the panels can provide a lot of support effect on the wall column and can restrain bending and torsion of the steel column. So it can enhance the stability capacity of column. Therefore the support effect of wall panels should be considered in the design and the wall panels and column should be treated as the composite panel.Compression performance of experimental and theoretical analysis is carried out for the web steel wall the pressure on the incomparable performance, including the following:(1) Axial compression tests of web steel wall is described. Specimens in these tests include a single truss column, four square columns and five web steel walls. Ultimate load is obtained and difference of failure mode is analyzed.Experiments show that the ultimate load of the column with double panel is 2 times of steel skeleton wall and the supporting role of panel to improve the column's ultimate capacity is obvious.(2) According to technical code cold-formed thin-wall steel structures, truss columns, square columns and steel frame without panels are calculated and compared with experimental results. Truss columns and square columns are as calculated as lattice column in accordance with existing codes. The carrying capacity of the wall skeleton can be studied according to the instability of the frame with lateral displacement.(3) For the composite wall with double panel, the ultimate load of wall studs are established respectively used differential equation of equilibrium and energy method.Constraint of panel to stud is simplified elastic support. For the wall under centric axial compression simply supported at both ends, buckling load formula considering shear deformation is derived based on the model of spring support.The total potential equation of column with continuous supports is established using energy method (Rayleigh-Ritz method). Ultimate loads are obtained under a variety of column boundary conditions using variation principle.The ultimate load of theoretical value and the experimental results are in good agreement for the end-conditions that two ends are simply supported and one end is fixed and other end is simply supported. It shows that the model of elastic supports is reasonable. These works provide theoretical basis for further improvement of the design method and provide any new ideas for the stability study of the web steel wall.